A precise measurement of the cross section of the process e+e−→π+π−(γ) from threshold to an energy of 3 GeV is obtained with the initial-state radiation (ISR) method using 232  fb−1 of data collected with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV. The ISR luminosity is determined from a study of the leptonic process e+e−→μ+μ−(γ)γISR, which is found to agree with the next-to-leading-order QED prediction to within 1.1%. The cross section for the process e+e−→π+π−(γ) is obtained with a systematic uncertainty of 0.5% in the dominant ρ resonance region. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the measured ππ cross section from threshold to 1.8 GeV is (514.1±2.2(stat)±3.1(syst))×10−10.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Precise measurement of the e(+)e(-) -> pi(+)pi(-)(gamma) cross section with the initial-state radiation method at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(3), 1-49 [10.1103/PhysRevD.86.032013].

Precise measurement of the e(+)e(-) -> pi(+)pi(-)(gamma) cross section with the initial-state radiation method at BABAR

PATRIGNANI, CLAUDIA;
2012

Abstract

A precise measurement of the cross section of the process e+e−→π+π−(γ) from threshold to an energy of 3 GeV is obtained with the initial-state radiation (ISR) method using 232  fb−1 of data collected with the BABAR detector at e+e− center-of-mass energies near 10.6 GeV. The ISR luminosity is determined from a study of the leptonic process e+e−→μ+μ−(γ)γISR, which is found to agree with the next-to-leading-order QED prediction to within 1.1%. The cross section for the process e+e−→π+π−(γ) is obtained with a systematic uncertainty of 0.5% in the dominant ρ resonance region. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the measured ππ cross section from threshold to 1.8 GeV is (514.1±2.2(stat)±3.1(syst))×10−10.
2012
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2012). Precise measurement of the e(+)e(-) -> pi(+)pi(-)(gamma) cross section with the initial-state radiation method at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(3), 1-49 [10.1103/PhysRevD.86.032013].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/535519
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